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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.join.aggregations;
import org.apache.lucene.search.Query;
import org.elasticsearch.search.aggregations.Aggregator;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.NonCollectingAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.aggregations.support.ValuesSource.Bytes.ParentChild;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregatorFactory;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public class ChildrenAggregatorFactory
extends ValuesSourceAggregatorFactory<ValuesSource.Bytes.WithOrdinals.ParentChild, ChildrenAggregatorFactory> {
private final String parentType;
private final Query parentFilter;
private final Query childFilter;
public ChildrenAggregatorFactory(String name, ValuesSourceConfig<ParentChild> config, String parentType, Query childFilter,
Query parentFilter, SearchContext context, AggregatorFactory<?> parent, AggregatorFactories.Builder subFactoriesBuilder,
Map<String, Object> metaData) throws IOException {
super(name, config, context, parent, subFactoriesBuilder, metaData);
this.parentType = parentType;
this.childFilter = childFilter;
this.parentFilter = parentFilter;
}
@Override
protected Aggregator createUnmapped(Aggregator parent, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData)
throws IOException {
return new NonCollectingAggregator(name, context, parent, pipelineAggregators, metaData) {
@Override
public InternalAggregation buildEmptyAggregation() {
return new InternalChildren(name, 0, buildEmptySubAggregations(), pipelineAggregators(), metaData());
}
};
}
@Override
protected Aggregator doCreateInternal(ValuesSource.Bytes.WithOrdinals.ParentChild valuesSource, Aggregator parent,
boolean collectsFromSingleBucket, List<PipelineAggregator> pipelineAggregators, Map<String, Object> metaData)
throws IOException {
long maxOrd = valuesSource.globalMaxOrd(context.searcher(), parentType);
return new ParentToChildrenAggregator(name, factories, context, parent, parentType, childFilter, parentFilter, valuesSource, maxOrd,
pipelineAggregators, metaData);
}
}
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